As trade grew, medieval cities became:
a) less crowded
b) cleaner
c) overcrowded and unsanitary
d) self-sufficient

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .

answer; the president uses mass media to gain support for policies;

answer; avoiding style;